1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2009 Robert N. M. Watson
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29/*
30 * When an interface has been detached but not yet freed, we set the various
31 * ifnet function pointers to "ifdead" versions.  This prevents unexpected
32 * calls from the network stack into the device driver after if_detach() has
33 * returned.
34 */
35
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD$");
38
39#include <sys/param.h>
40#include <sys/mbuf.h>
41#include <sys/socket.h>
42
43#include <net/if.h>
44#include <net/if_var.h>
45
46static int
47ifdead_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa,
48    struct route *ro)
49{
50
51	m_freem(m);
52	return (ENXIO);
53}
54
55static void
56ifdead_input(struct ifnet *ifp, struct mbuf *m)
57{
58
59	m_freem(m);
60}
61
62static void
63ifdead_start(struct ifnet *ifp)
64{
65
66}
67
68static int
69ifdead_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
70{
71
72	return (ENXIO);
73}
74
75static int
76ifdead_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
77    struct sockaddr *sa)
78{
79
80	*llsa = NULL;
81	return (ENXIO);
82}
83
84static void
85ifdead_qflush(struct ifnet *ifp)
86{
87
88}
89
90static int
91ifdead_transmit(struct ifnet *ifp, struct mbuf *m)
92{
93
94	m_freem(m);
95	return (ENXIO);
96}
97
98static uint64_t
99ifdead_get_counter(struct ifnet *ifp, ift_counter cnt)
100{
101
102	return (0);
103}
104
105static int
106ifdead_snd_tag_alloc(struct ifnet *ifp, union if_snd_tag_alloc_params *params,
107    struct m_snd_tag **ppmt)
108{
109	return (EOPNOTSUPP);
110}
111
112static int
113ifdead_snd_tag_modify(struct m_snd_tag *pmt, union if_snd_tag_modify_params *params)
114{
115	return (EOPNOTSUPP);
116}
117
118static int
119ifdead_snd_tag_query(struct m_snd_tag *pmt, union if_snd_tag_query_params *params)
120{
121	return (EOPNOTSUPP);
122}
123
124static void
125ifdead_snd_tag_free(struct m_snd_tag *pmt)
126{
127}
128
129static void
130ifdead_ratelimit_query(struct ifnet *ifp __unused,
131      struct if_ratelimit_query_results *q)
132{
133	/*
134	 * This guy does not support
135	 * this interface. Not sure
136	 * why we would specify a
137	 * flag on the interface
138	 * that says we do.
139	 */
140	q->rate_table = NULL;
141	q->flags = RT_NOSUPPORT;
142	q->max_flows = 0;
143	q->number_of_rates = 0;
144}
145
146void
147if_dead(struct ifnet *ifp)
148{
149
150	ifp->if_output = ifdead_output;
151	ifp->if_input = ifdead_input;
152	ifp->if_start = ifdead_start;
153	ifp->if_ioctl = ifdead_ioctl;
154	ifp->if_resolvemulti = ifdead_resolvemulti;
155	ifp->if_qflush = ifdead_qflush;
156	ifp->if_transmit = ifdead_transmit;
157	ifp->if_get_counter = ifdead_get_counter;
158	ifp->if_snd_tag_alloc = ifdead_snd_tag_alloc;
159	ifp->if_snd_tag_modify = ifdead_snd_tag_modify;
160	ifp->if_snd_tag_query = ifdead_snd_tag_query;
161	ifp->if_snd_tag_free = ifdead_snd_tag_free;
162	ifp->if_ratelimit_query = ifdead_ratelimit_query;
163}
164